No I've a fixed camera but I'm considering swapping to the adjustable. I can see it has the same connector, so am reasonably confident it'd be compatible.
Your reluctant installation, if I were suffering the same problem I think I'd be considering a loose connection or maybe the camera itself has become slow to wake up. The electronics box only powers the camera whilst in reverse. So the camera is having a cold start each time you reverse.
With regards to the angle of view of the fixed camera, I've attached an image so others can make their own conclusions as to whether it needs tilting up or not.
I have to say having used it for a month now, I wouldn't want to be without it.